Only activate declspec import/export attributes on Windows. The
resulting header is close to CMakes suggestions:
https://cmake.org/cmake/help/latest/guide/tutorial/Selecting%20Static%20or%20Shared%20Libraries.html
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Fixes#36117
Note: I chose option B) from my post in the issue.
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* [docopt] Add docopt.cpp to fix#3935
* [docopt] Cleanup
* [docopt] Disable vcpkg_test_cmake due to misbehavior on x64
* [docopt] Install only one flavor (static/shared)
